Hi Lori! Yes, that can be really scary. I have had an irregular heartbeat for most of my life and it seems it’s from anxiety, or so they tell me now. I rarely have it show up when I’m being monitored. I am a meditator and have learned to sometimes, not all of the time, get my heart to stop jumping out of my chest with breath work.
How long have you had this? And yea doctors don’t always have an answer as to why this is happening. I also have thyroid problems